9 tools live · no signup to try
The sysadmin jobs you keep doing by hand
Working out why your mail goes to spam. Migrating a mailbox. Cleaning a list before a send. Rebuilding a site that no longer exists. Each one is an afternoon of fiddly work — or one job here.
What is not checked is not scored. If a blacklist does not answer, those points are not counted as passing: a lower number and the reason, never a green tick that means nothing. A false pass is worse than an honest gap.
The tools
Every one of them started as a job that had to be done for a real server, this week.
Mail Tester
Free: daily allowanceSend a real email, get it scored
Verifies the DKIM signature against that exact message, checks SPF against the IP that really delivered it, runs a real spam engine, and flags broken links, image-heavy bodies and missing unsubscribe headers.
Open →Mail Doctor
Free: daily allowanceCheck a domain without sending
The quick DNS-side check: SPF, DKIM, DMARC, MX, reverse DNS, TLS and blacklists. Counts the SPF DNS lookups for real — going over ten silently disables it. For the full picture, send a real message to Mail Tester.
Open →IMAP Migration
Free: dry run onlyMove mailboxes between servers
Keeps folders, read marks and original dates. Run it as many times as you need: what is already copied is skipped, never duplicated.
Open →List Verification
Free: 100 addressesClean a list before you send
Syntax, dead domains, disposable inboxes, role accounts and typos. Four verdicts, not two — saying "valid" when the honest answer is "unknown" costs you real customers.
Open →Archive Recovery
Free: 5 pagesRebuild a site that is gone
Pulls what the Internet Archive kept and gives you Markdown ready for Astro — not a dump of ten-year-old HTML you cannot reuse.
Open →And the quick ones
No queue, no waiting, nothing kept. The small things you end up looking up in the middle of doing something else.
What is my IP address
no limitYour address, and what kind it is
IPv4 or IPv6, its reverse DNS, and whether your ISP has you behind CGNAT — which is the real reason port forwarding will not work. Answers in plain text from a terminal too.
Is It Down
no limitIs that site down, or is it just you
Checked from here, which is the only thing you cannot do yourself. Says whether it answers, whether it answers badly, and whether the name even exists — and if this server is the one having trouble, it says that instead of blaming the site.
Speed test
capped per hourDownload, upload and latency
Discards TCP slow start, uses several connections and times them by the wall clock. Says what it threw away and when a run was too short to believe.
Password generator
nothing leaves the pagePasswords and passphrases, in your browser
Generated with the system random number generator and never sent anywhere. The strength shown is counted exactly, including what requiring a symbol takes away.
Built for jobs that take hours
01 · queue
Nothing runs in a request
A 30 GB mailbox takes hours. Jobs are queued, resumable, and survive a worker dying mid-run.
02 · live
You watch it happen
Progress streams as it goes, so a long job reads as "mailbox 340 of 1,200" instead of a spinner you stop trusting.
03 · safe
Credentials are deleted
Encrypted while a job needs them, wiped the moment it ends. The source mailbox is always opened read-only.
Pricing
The free tier is a real tool, not a teaser — but it stops where the work gets expensive.
Free
No account.
- ·Mail Tester — daily allowance
- ·Mail Doctor — daily allowance
- ·IMAP Migration — dry run only
- ·List Verification — 100 addresses
- ·Archive Recovery — 5 pages
The quick tools — What is my IP address, Is It Down, Speed test, Password generator — have no account, no limit worth mentioning and nothing to pay. The speed test is capped per hour because it spends real bandwidth, and it says so on the page.
Paid
Price not set yet.
- ·Real migrations, not just dry runs
- ·Whole lists, with mailbox probing
- ·Full site recovery, images included
- ·API access with your own key
- ·Higher daily and concurrent limits
- ·Continuous monitoring — your sending IPs against the blacklists, your certificates and domains before they expire, and your DNS records if the MX or the nameservers move. Email or webhook when something changes.
Every tool hands you its result to keep — the cleaned list, the report you send on, the migration plan. What is not built yet is putting your own name on those reports instead of ours: it is on the list, but it is not something you would be paying for today.